[TowerTalk] Log periodic antennas and front end overload?
W5CPT
w5cpt at bellsouth.net
Sun Oct 25 18:37:49 PDT 2009
What K9YC said. Years ago when the front of the receiver was a wide as a barn door this was true, but with today's modern solid state receivers I don't believe it is any longer the case. I have a Tennadyne LPDA into an Icom IC-756 (non Pro) and have never had a overload problem even when I lived in RF rich Dallas TX. With the present state of the art equipment, I do not think you will have a problem. Some one else stated "one boom - one feedline" and that is the reason I went with a LPDA. I love having a gain antenna when the DXpedition goes to 17M to avoid the pile-up.
Clint - W5CPT - Moderator Tennadyne Antenna Yahoo Group
----- Original Message -----
From: Mat Eshpeter
To: towertalk at contesting.com
Sent: 25 October, 2009 6:55 PM
Subject: [TowerTalk] Log periodic antennas and front end overload?
I have searched the Towertalk archives and read that log periodic antennas can have the undesirable side effect of capturing too much RF; their broadbanded capability results in all signals in the antenna's "passband" being presented to the receiver. Strong out-of-band signals such as SW broadcast signals, strong contest stations, etc. could lead to undesirable performance at the receiver -- it is this issue that I am trying to quantify.
I am looking for solid factual experience from folks who have directly witnessed how log periodic antennas can affect the front end of today's HF transceivers. My ridge-top QTH will have a clear shot to the horizon in almost all directions and I am trying to figure out if a log periodic will work for me. The other option would be a multiband antenna like the Force 12 5BA or similar.
thanks in advance,
Mat
KK1C
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